
/**
 * @author oven:
 * @version 创建时间：2013-1-31 下午4:59:55
 * 
 */
public class SHA1 {  
    private final int[] abcde = {  
            0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0  
        };  
  
    // 摘要数据存储数组  
    private int[] digestInt = new int[5];  
  
    // 计算过程中的临时数据存储数组  
    private int[] tmpData = new int[80];  
  
    // 计算sha-1摘要  
    private int process_input_bytes(byte[] bytedata) {  
        // 初试化常量  
        System.arraycopy(abcde, 0, digestInt, 0, abcde.length);  
  
        // 格式化输入字节数组，补10及长度数据  
        byte[] newbyte = byteArrayFormatData(bytedata);  
  
        // 获取数据摘要计算的数据单元个数  
        int MCount = newbyte.length / 64;  
  
        // 循环对每个数据单元进行摘要计算  
        for (int pos = 0; pos < MCount; pos++) {  
            // 将每个单元的数据转换成16个整型数据，并保存到tmpData的前16个数组元素中  
            for (int j = 0; j < 16; j++) {  
                tmpData[j] = byteArrayToInt(newbyte, (pos * 64) + (j * 4));  
            }  
  
            // 摘要计算函数  
            encrypt();  
        }  
  
        return 20;  
    }  
  
    // 格式化输入字节数组格式  
    private byte[] byteArrayFormatData(byte[] bytedata) {  
        // 补0数量  
        int zeros = 0;  
  
        // 补位后总位数  
        int size = 0;  
  
        // 原始数据长度  
        int n = bytedata.length;  
  
        // 模64后的剩余位数  
        int m = n % 64;  
  
        // 计算添加0的个数以及添加10后的总长度  
        if (m < 56) {  
            zeros = 55 - m;  
            size = n - m + 64;  
        } else if (m == 56) {  
            zeros = 63;  
            size = n + 8 + 64;  
        } else {  
            zeros = 63 - m + 56;  
            size = (n + 64) - m + 64;  
        }  
  
        // 补位后生成的新数组内容  
        byte[] newbyte = new byte[size];  
        // 复制数组的前面部分  
        System.arraycopy(bytedata, 0, newbyte, 0, n);  
  
        // 获得数组Append数据元素的位置  
        int l = n;  
        // 补1操作  
        newbyte[l++] = (byte) 0x80;  
  
        // 补0操作  
        for (int i = 0; i < zeros; i++) {  
            newbyte[l++] = (byte) 0x00;  
        }  
  
        // 计算数据长度，补数据长度位共8字节，长整型  
        long N = (long) n * 8;  
        byte h8 = (byte) (N & 0xFF);  
        byte h7 = (byte) ((N >> 8) & 0xFF);  
        byte h6 = (byte) ((N >> 16) & 0xFF);  
        byte h5 = (byte) ((N >> 24) & 0xFF);  
        byte h4 = (byte) ((N >> 32) & 0xFF);  
        byte h3 = (byte) ((N >> 40) & 0xFF);  
        byte h2 = (byte) ((N >> 48) & 0xFF);  
        byte h1 = (byte) (N >> 56);  
        newbyte[l++] = h1;  
        newbyte[l++] = h2;  
        newbyte[l++] = h3;  
        newbyte[l++] = h4;  
        newbyte[l++] = h5;  
        newbyte[l++] = h6;  
        newbyte[l++] = h7;  
        newbyte[l++] = h8;  
  
        return newbyte;  
    }  
  
    private int f1(int x, int y, int z) {  
        return (x & y) | (~x & z);  
    }  
  
    private int f2(int x, int y, int z) {  
        return x ^ y ^ z;  
    }  
  
    private int f3(int x, int y, int z) {  
        return (x & y) | (x & z) | (y & z);  
    }  
  
    private int f4(int x, int y) {  
        return (x << y) | x >>> (32 - y);  
    }  
  
    // 单元摘要计算函数  
    private void encrypt() {  
        for (int i = 16; i <= 79; i++) {  
            tmpData[i] = f4(tmpData[i - 3] ^ tmpData[i - 8] ^ tmpData[i - 14] ^  
                    tmpData[i - 16], 1);  
        }  
  
        int[] tmpabcde = new int[5];  
  
        for (int i1 = 0; i1 < tmpabcde.length; i1++) {  
            tmpabcde[i1] = digestInt[i1];  
        }  
  
        for (int j = 0; j <= 19; j++) {  
            int tmp = f4(tmpabcde[0], 5) +  
                f1(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4] +  
                tmpData[j] + 0x5a827999;  
            tmpabcde[4] = tmpabcde[3];  
            tmpabcde[3] = tmpabcde[2];  
            tmpabcde[2] = f4(tmpabcde[1], 30);  
            tmpabcde[1] = tmpabcde[0];  
            tmpabcde[0] = tmp;  
        }  
  
        for (int k = 20; k <= 39; k++) {  
            int tmp = f4(tmpabcde[0], 5) +  
                f2(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4] +  
                tmpData[k] + 0x6ed9eba1;  
            tmpabcde[4] = tmpabcde[3];  
            tmpabcde[3] = tmpabcde[2];  
            tmpabcde[2] = f4(tmpabcde[1], 30);  
            tmpabcde[1] = tmpabcde[0];  
            tmpabcde[0] = tmp;  
        }  
  
        for (int l = 40; l <= 59; l++) {  
            int tmp = f4(tmpabcde[0], 5) +  
                f3(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4] +  
                tmpData[l] + 0x8f1bbcdc;  
            tmpabcde[4] = tmpabcde[3];  
            tmpabcde[3] = tmpabcde[2];  
            tmpabcde[2] = f4(tmpabcde[1], 30);  
            tmpabcde[1] = tmpabcde[0];  
            tmpabcde[0] = tmp;  
        }  
  
        for (int m = 60; m <= 79; m++) {  
            int tmp = f4(tmpabcde[0], 5) +  
                f2(tmpabcde[1], tmpabcde[2], tmpabcde[3]) + tmpabcde[4] +  
                tmpData[m] + 0xca62c1d6;  
            tmpabcde[4] = tmpabcde[3];  
            tmpabcde[3] = tmpabcde[2];  
            tmpabcde[2] = f4(tmpabcde[1], 30);  
            tmpabcde[1] = tmpabcde[0];  
            tmpabcde[0] = tmp;  
        }  
  
        for (int i2 = 0; i2 < tmpabcde.length; i2++) {  
            digestInt[i2] = digestInt[i2] + tmpabcde[i2];  
        }  
  
        for (int n = 0; n < tmpData.length; n++) {  
            tmpData[n] = 0;  
        }  
    }  
  
    // 4字节数组转换为整数  
    private int byteArrayToInt(byte[] bytedata, int i) {  
        return ((bytedata[i] & 0xff) << 24) | ((bytedata[i + 1] & 0xff) << 16) |  
        ((bytedata[i + 2] & 0xff) << 8) | (bytedata[i + 3] & 0xff);  
    }  
  
    // 整数转换为4字节数组  
    private void intToByteArray(int intValue, byte[] byteData, int i) {  
        byteData[i] = (byte) (intValue >>> 24);  
        byteData[i + 1] = (byte) (intValue >>> 16);  
        byteData[i + 2] = (byte) (intValue >>> 8);  
        byteData[i + 3] = (byte) intValue;  
    }  
  
    // 将字节转换为十六进制字符串  
    private static String byteToHexString(byte ib) {  
        char[] Digit = {  
                '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c',  
                'd', 'e', 'f'  
            };  
        char[] ob = new char[2];  
        ob[0] = Digit[(ib >>> 4) & 0X0F];  
        ob[1] = Digit[ib & 0X0F];  
  
        String s = new String(ob);  
  
        return s;  
    }  
  
    // 将字节数组转换为十六进制字符串  
    private static String byteArrayToHexString(byte[] bytearray) {  
        String strDigest = "";  
  
        for (int i = 0; i < bytearray.length; i++) {  
            strDigest += byteToHexString(bytearray[i]);  
        }  
  
        return strDigest;  
    }  
  
    // 计算sha-1摘要，返回相应的字节数组  
    public byte[] getDigestOfBytes(byte[] byteData) {  
        process_input_bytes(byteData);  
  
        byte[] digest = new byte[20];  
  
        for (int i = 0; i < digestInt.length; i++) {  
            intToByteArray(digestInt[i], digest, i * 4);  
        }  
  
        return digest;  
    }  
  
    // 计算sha-1摘要，返回相应的十六进制字符串  
    public String getDigestOfString(byte[] byteData) {  
        return byteArrayToHexString(getDigestOfBytes(byteData));  
    }  
  
    public static void main(String[] args) {  
        String data = "1";  
        System.out.println(data);  
  
        String digest = new SHA1().getDigestOfString(data.getBytes());  
        System.out.println(digest);  
    }  
}  
